How to Speed Up a Slow Computer: 10 Easy Fixes (2026)

Technology

Illustration showing how to speed up a slow computer using quick hardware and software fixes

5 min read

Quick Answer
To speed up a slow computer, restart it, close unused apps and browser tabs, free up storage space, turn off unnecessary startup programs, and run a malware scan. If it’s still slow after that and it’s less than five years old, adding RAM or switching to an SSD usually fixes it.

Your computer used to load pages in a second. Now you click something and go make a cup of tea while it thinks about it. You’re not imagining it, and you don’t need to buy a new machine just yet. Most slow computers can be fixed in under an hour, often for free.

Why Is Your Computer Running So Slow?

Before you fix anything, it helps to know what’s actually causing the drag. A slow computer is almost always one (or more) of these:

Too many programs launching automatically when you turn it on
A hard drive that’s nearly full
Malware or adware running quietly in the background
Outdated software or an operating system that hasn’t been updated in a while
Ageing hardware that’s simply reached its limit
Too many browser tabs and apps open at once

Once you know which of these applies to you, the fix usually takes minutes, not hours.

Start With the Fastest Fixes (Under 5 Minutes)

1. Restart your computer

It sounds too simple to work, but it usually does. Restarting clears out your computer’s short-term memory and shuts down any background process that’s got stuck. Do this first, every time, before anything else on this list.

2. Close what you’re not using

Twenty browser tabs and four programs are fighting for your computer’s memory. What is your computer’s memory doing currently? If you have a tab or program that you do not actively use right now, close it. If you are having trouble doing this, you can instead open Task Manager (Windows: Ctrl+Shift+Esc, Mac: Activity Monitor) and try to end it from there.

Free Up Storage Space

A computer needs breathing room to work efficiently. Once your drive gets close to full, everything slows down, including simple tasks like opening a file. Aim to keep at least 15-20% of your storage free.

Uninstall programs you haven’t opened in the last year
Empty your recycle bin or trash
Move old photos and videos to a cloud drive or external hard drive
Run Disk Cleanup on Windows or use Storage Management on a Mac

Stop Programs Launching at Startup

A multitude of apps tend to silently add themselves to the list of programs that launch automatically when a computer starts up, which considerably slows down the startup time of a computer that previously booted up quickly. On Windows, open Task Manager and go to the Startup Apps tab, then disable all the apps you do not need to launch every time you turn on your computer. On a Mac, open System Settings, go to General > Login Items, and delete all the apps you do not need.

Rule Out Malware

Malware can often be silent, using up system resources without notice. Scan your system with anti-virus software to detect and remove any threats. If you don’t have anti-virus software, Windows comes with Defender, which is a reliable free option.

When It’s Time to Upgrade the Hardware

If you’ve tried everything above and your computer is still crawling, the problem might genuinely be the hardware. Here’s a quick guide to what’s usually worth fixing versus replacing outright.

Upgrade	What It Fixes	Rough Cost (USD)
Add more RAM	Slow multitasking, laggy when many tabs/apps are open	$30-$80
Switch to an SSD	Slow boot time, slow file loading, general sluggishness	$40-$100
New battery (laptop)	Sudden slowdowns tied to power-saving mode	$40-$90
New computer	Old hardware can’t run current software well, 6+ years old	$400+

A rough rule of thumb: if your computer is under five years old, an upgrade almost always beats a replacement on cost. Past that age, you’re often better off putting the money toward something new, since older hardware also tends to fall out of software and security support.

The Bottom Line

A slow computer is a frustrating prospect, although it generally has easy fixes. Try the first few solutions before spending any money. If you’ve tried restarting your computer, deleting programs you don’t need, decluttering your files, removing unneeded startup programs, and scanned for viruses with no luck, it’s probably time to invest in a $30-$80 ram upgrade or a new SSD, instead of a whole new computer.

Frequently Asked Questions

Why is my computer suddenly so slow?

A sudden slowdown usually points to one specific cause: a recent update running in the background, a full hard drive, or malware. A gradual slowdown over months is more often too many startup programs and a cluttered disk piling up.

Does restarting my computer actually help?

Yes. Restarting clears your computer’s memory (RAM) and closes any stuck background processes. It’s the single fastest fix and worth doing before anything else.

How much free storage space should I keep?

Aim to keep at least 15-20% of your drive free. When storage gets too full, your computer has less room to manage temporary files, which slows everything down.

Will more RAM speed up an old computer?

Often, yes. More RAM helps most when you multitask heavily or keep dozens of browser tabs open. If your computer is more than six years old, though, an SSD or a full replacement may give better results for the money.

Can a virus make my computer slow?

Yes. Malware and adware often run hidden background processes that eat up CPU and memory. A full scan with a reputable anti-virus tool is a quick way to rule this out.

Is it cheaper to upgrade or replace an old computer?

For most computers under five years old, an upgrade (RAM or SSD) costs far less than a replacement and solves the slowdown. Past that age, hardware and software support both start to fall behind, so a new computer usually pays off faster.